Master traitor, apparently, in the revolution (5)

I believe the answer is:

marat

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'apparently in the revolution' is the definition.
I can't judge whether this definition defines the answer.

'master traitor' is the wordplay.
'master' becomes 'ma' (Master of Arts).
'traitor' becomes 'rat' (rat can mean a treacherous person).
'ma'+'rat'='MARAT'

Can you help me to learn more?

(Other definitions for marat that I've seen before include "murdered radical" , "revolutionary stabbed" , "Revolutionary leader" , "Charlotte Corday murdered him in his bath" , "French revolutionary politician" .)

I've seen this clue in the Evening Standard.

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